Free drawing
Draw any molecule and find out what it is. The panel next to the editor updates as you draw.
Where the information comes from
The molecular formula, molar mass, functional groups and stereochemistry are worked out in your browser by RDKit, the same open-source toolkit that checks the exercises, using the same rules: a drawing that is not chemically valid (for example a carbon with five bonds) is pointed out instead of being named.
Names come from two places. Structures that appear in this site's exercises get the name checked for those exercises. For anything else the name is looked up in PubChem, the chemistry database of the US National Library of Medicine (you can turn this off next to the drawing). A name is shown only when PubChem's record has exactly the structure you drew; a record that merely shares its InChI code (for example another tautomer) is reported as different. PubChem's systematic names are computed by software and are generally reliable, but they can differ in style from the names your course uses.
Want practice with feedback instead? Draw structures from their names.